[REQUEST] Add int8 grid to python bindings

[OasisArtisan]

Int8 is a very common GRID when doing occupancy grids and log-odds occupancy mapping as they are very efficient. The robotics community's interest in openvdb is growing and it would be nice to have them bound to python by default when setting OPENVDB_PYTHON_WRAP_ALL_GRID_TYPES to true. Possibly more types such as int16 are also useful.

For now I had to add it myself and recompile openvdb.

[linux-foundation-easycla[bot]]

• :white_check_mark:login: OasisArtisan / (ab5b532e6f4237838a7d7a8e466d86f09abfcaa8)

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